How long can you survive in space without a space suit ?

Ok this is serious question that came to me after watching an episode of stargate (don't laugh). In this episode, O'neil and Teal'c are trapped in a ship and are rescued by another one. But to escape their ship they have to blow the top off, free float away from the ship for 5-6 sec before being... show more Ok this is serious question that came to me after watching an episode of stargate (don't laugh). In this episode, O'neil and Teal'c are trapped in a ship and are rescued by another one. But to escape their ship they have to blow the top off, free float away from the ship for 5-6 sec before being transported aboard the other one.

So my question is this, can you survice in space for 5-6 seconds without a space suit ? If not, what's the main reason you would die instantly ?
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